July 2013, Google Play store had over one million Android apps published, and over 50 billion apps downloaded. According to a developer survey conducted in April–May 2013, 71% of mobile developers develop for Android. At Google I/O 2014, the company revealed that there were over one billion active monthly Android users, up from 538 million in June 2013. As of 2015, Android has the largest installed base of all general-purpose operating systems. Hence

While designing mobile app, one should consider: user interface design and user experience design. Few key parameters, which must be followed, includes 1. Simplicity 2. Consistency 3. Right use of color pallette 4. Clear work flow. Understand the purpose of your app from the customer's perspective and the ways the app will benefit the business or make money. A professional app UI developer, who has worked on the same kind of apps, may definitely save your time.